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MathGroup Archive 2011

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Re: Is there ToNumber?


... ToExpression["1 e^3"]

It looks for an string, that smells a little bit like a expression. I 
think it is good idea to offer something, that can be interpreted as an 
exponent.

Kind regards

Peter

Am 12.06.2011 11:07, schrieb ADL:
> On 11 Giu, 12:52, "Dr. Peter Klamser"<klam... at googlemail.com>  wrote:
>> ... ToExpression["1+1"]
>>
>> One Hint: If you know a function in Mathematica like "ToString", you
>> mentioned in your email, look in the help system in the section "see
>> also", there you find ToExpression["1+1"].
>>
>> Kind regards
>>
>> Peter
>>
>> Am 11.06.2011 09:59, schrieb Ted Sariyski:
>>
>>> Hi,
>>> Is there a built-in function which returns the numeric value of a string
>>> (like ToString but inverse).  Currently I use mine function toNumber:
>>>     ch = StringToStream[timeStr];
>>>     timeNum = Read[ch, Number];
>>>     Close[ch];
>>> but I suspect there is easier way.
>>> Thanks in advance,
>>> --Ted
>> --
>> Mit freundlichen Gr en
>>
>> Uta&   Peter Klamser
> The request is less trivial than ToExpression["1+1"] since, for
> example, typical number format cannot be read into Mathematica without
> the rather involved trick reported by Ted Sariyski. As an example,
>
> ToExpression["1e3"]
> ==>  e3
>
>
> ch = StringToStream["1e3"];
> timeNum = Read[ch, Number];
> Close[ch];
> timeNum
> ==>  1000
>
> I feel this complication as rather unfortunate, unless I am also
> missing a simpler way to read in numbers.
>
> ADL
>


-- 
Mit freundlichen Grüßen

Uta&  Peter Klamser



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